[vtkusers] Picker + Interactor Style Problems

[Lachlan Blackhall]

Gday,

I want to be able to do picking with my mouse so i have created a new 
function derived from vtkCommand that i get to respond to a 
leftbuttonpressevent.
Once im in this event i want to generate an endpick event so that my 
picking script gets called.

I dont really know how to do this. I tried


	       vtkInteractorStyle *style=vtkInteractorStyle::New();
		vtkRenderWindowInteractor *iren = 
reinterpret_cast<vtkRenderWindowInteractor*>(caller);
		iren->SetInteractorStyle(style);
		iren->SetKeyCode(int ('p'));
		style->OnChar();

which works fine but this destroys all the original mouse interaction 
capabilities (zoom, rotate etc..). If i do the following the program 
crashes after i click an actor


		vtkInteractorStyle *style=vtkInteractorStyle::New();
		vtkRenderWindowInteractor *iren = 
reinterpret_cast<vtkRenderWindowInteractor*>(caller);
		
		vtkInteractorStyle *style_orig = (vtkInteractorStyle *) 
iren->GetInteractorStyle();
		
		iren->SetInteractorStyle(style);
		iren->SetKeyCode(int ('p'));
		style->OnChar();
		iren->SetInteractorStyle(style_orig);

I have set up another function and callback to respond to the pick 
event and using gdb i know that this callback occurs with both blocks 
of code just the second one (which i need so it zooms and such) wont 
work.

If i try


		vtkRenderWindowInteractor *iren = 
reinterpret_cast<vtkRenderWindowInteractor*>(caller);
		vtkInteractorStyle *style = (vtkInteractorStyle *) 
iren->GetInteractorStyle();
		iren->SetKeyCode(int ('p'));
		style->OnChar();

then the pick event is no longer generated. ????????????????

any help would be appreciated

thanks


Lachlan
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